Pentamethyl
五甲基
🗣️ 情景例句
I have the key, but it doesn't work.
我有钥匙， 但是开不开箱子。
Nothing venture, nothing win (or have or gain).
不入虎穴，焉得虎子。
for it is then almost ready to undertake heavy work and can begin to earn its keep straight away.
这个年龄的象差不多已能干重活，可以很快挣回饲养它的开支。